A method for preparing high-purity tellurium based on viscous distillation and gas-phase separation was developed.By adjusting the condenser structure and condensing temperature to achieve viscous distillation,the dominant condensation zone for tellurium was controlled;hence,poorly volatile substances remained in the crucible,while selenium was separated from tellurium in the gas phase to achieve the purification of metallurgical-grade crude tellurium.Specifically,the saturated vapor pressure,mean free path of tellurium,impurity distribution,and morphologies of the condensate at different locations were investigated in detail.The results for a 500 g upscaled experiment showed that the direct yield of Te was 83.40％,the purity of Te reached higher than 99.9996 wt.％and the selenium content in the dominant condensation zone was reduced to 2.76×10-4 wt.％under the optimal experimental conditions of 5 Pa,773 K and 90 min.
关键词
高纯碲/除硒/提纯/平均自由程/优势冷凝区
Key words
high-purity tellurium/selenium removal/refinement/mean free path/dominant condensation zone
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基金项目
国家重点研发计划(2022YFC2904900)
国家自然科学基金(U1902221)
Construction of High-level Talents of Kunming University of Science and Technology,China(20210172)
Leading Talents of Industrial Technology in Ten Thousand Talents Plan of Yunnan Province,China()
维普
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